<template>
  <div class="container">
    <div class="tree">
      <div class="shadow ts-3d"></div>
      <div class="trunk ts-3d">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
      </div>
      <div class="leaves-bottom ts-3d">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
      </div>
      <div class="leaves-middle ts-3d">
        <div class="ts-3d"></div>
        <div class="ts-3d"></div>
        <div class="ts-3d"></div>
        <div class="ts-3d"></div>
      </div>
      <div class="leaves-top ts-3d">
        <div class="ts-3d"></div>
        <div class="ts-3d"></div>
        <div class="ts-3d"></div>
        <div class="ts-3d"></div>
      </div>
      <div class="star star-1 ts-3d"></div>
      <div class="star star-2 ts-3d"></div>
      <div class="star star-3 ts-3d"></div>
      <div class="star star-4 ts-3d"></div>
      <div class="star star-5 ts-3d"></div>
      <div class="shine ts-3d"></div>
    </div>
    <div class="snow-container">
      <div class="snow snow-1 snow-y-1"></div>
      <div class="snow snow-2 snow-y-2"></div>
      <div class="snow snow-3 snow-y-3"></div>
      <div class="snow snow-4 snow-y-3"></div>
      <div class="snow snow-5 snow-y-2"></div>
      <div class="snow snow-6 snow-y-1"></div>
      <div class="snow snow-7 snow-y-1"></div>
      <div class="snow snow-8 snow-y-2"></div>
      <div class="snow snow-9 snow-y-3"></div>
      <div class="snow snow-10 snow-y-3"></div>
    </div>
  </div>
</template>

<script>
export default {}
</script>

<style lang="scss" scoped>
:root {
  --main-bg: #c2c2c2;
  --trunk-bg-1: #5e2100;
  --trunk-bg-2: #783e00;
  --leaves-bottom-bg-1: #0f980f;
  --leaves-bottom-bg-2: #3fc83f;
  --leaves-middle-bg-1: #1fa81f;
  --leaves-middle-bg-2: #4fd84f;
  --leaves-top-bg-1: #2fb82f;
  --leaves-top-bg-2: #5fe85f;
  --star-bg: #ffdd00;
  --shine-bg: #ffeb69;
  --snow-bg: #f2f2f2;
  --tree-width: 200px;
  --tree-height: 400px;
  --tree-rotate: -15deg;
  --trunk-width: 30px;
  --trunk-height: 400px;
  --trunk-angle: 4.3deg;
  --leaves-translate: 15px;
  --leaves-bottom-width: 100px;
  --leaves-bottom-height: 320px;
  --leaves-bottom-angle: 18.2deg;
  --leaves-middle-width: 80px;
  --leaves-middle-height: 220px;
  --leaves-middle-angle: 21.4deg;
  --leaves-top-width: 60px;
  --leaves-top-height: 140px;
  --leaves-top-angle: 25.5deg;
  --star-size: 20px;
}

.ts-3d {
  transform-style: preserve-3d;
}

.container {
  background-color: var(--main-bg);
  position: fixed;
  bottom: 0;
  left: 100px;
  width: 300px;
  height: 300px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tree {
  width: var(--tree-width);
  height: var(--tree-height);
  position: relative;
  transform-style: preserve-3d;
  transform: rotateX(var(--tree-rotate));
}

.trunk,
.leaves-bottom,
.leaves-middle,
.leaves-top {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  animation: 10s tree-rotate linear infinite;
}

.trunk div {
  border-top: none;
  border-left: solid var(--trunk-width) transparent;
  border-right: solid var(--trunk-width) transparent;
  position: absolute;
  bottom: 0;
  left: calc(50% - var(--trunk-width));
  transform-origin: bottom;
}

.trunk div:nth-child(1) {
  border-bottom: solid var(--trunk-height) var(--trunk-bg-1);
  transform: rotateX(var(--trunk-angle)) translateY(2px)
    translateZ(var(--trunk-width));
}

.trunk div:nth-child(2) {
  border-bottom: solid var(--trunk-height) var(--trunk-bg-2);
  transform: rotateY(90deg) rotateX(calc(var(--trunk-angle) * -1))
    translateY(2px) translateZ(calc(var(--trunk-width) * -1));
}

.trunk div:nth-child(3) {
  border-bottom: solid var(--trunk-height) var(--trunk-bg-1);
  transform: rotateX(calc(var(--trunk-angle) * -1)) translateY(2px)
    translateZ(calc(var(--trunk-width) * -1));
}

.trunk div:nth-child(4) {
  border-bottom: solid var(--trunk-height) var(--trunk-bg-2);
  transform: rotateY(-90deg) rotateX(calc(var(--trunk-angle) * -1))
    translateY(2px) translateZ(calc(var(--trunk-width) * -1));
}

.leaves-bottom div {
  border-top: none;
  border-left: solid var(--leaves-bottom-width) transparent;
  border-right: solid var(--leaves-bottom-width) transparent;
  position: absolute;
  top: var(--star-size);
  left: calc(50% - var(--leaves-bottom-width));
  transform-origin: bottom;
}

.leaves-bottom div:nth-child(1) {
  border-bottom: solid var(--leaves-bottom-height) var(--leaves-bottom-bg-1);
  transform: rotateX(var(--leaves-bottom-angle))
    translateY(var(--leaves-translate)) translateZ(var(--leaves-bottom-width));
}

.leaves-bottom div:nth-child(2) {
  border-bottom: solid var(--leaves-bottom-height) var(--leaves-bottom-bg-2);
  transform: rotateY(90deg) rotateX(calc(var(--leaves-bottom-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-bottom-width) * -1));
}

.leaves-bottom div:nth-child(3) {
  border-bottom: solid var(--leaves-bottom-height) var(--leaves-bottom-bg-1);
  transform: rotateX(calc(var(--leaves-bottom-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-bottom-width) * -1));
}

.leaves-bottom div:nth-child(4) {
  border-bottom: solid var(--leaves-bottom-height) var(--leaves-bottom-bg-2);
  transform: rotateY(-90deg) rotateX(calc(var(--leaves-bottom-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-bottom-width) * -1));
}

.leaves-middle div {
  border-top: none;
  border-left: solid var(--leaves-middle-width) transparent;
  border-right: solid var(--leaves-middle-width) transparent;
  position: absolute;
  top: var(--star-size);
  left: calc(50% - var(--leaves-middle-width));
  transform-origin: bottom;
}

.leaves-middle div:nth-child(1) {
  border-bottom: solid var(--leaves-middle-height) var(--leaves-middle-bg-1);
  transform: rotateX(var(--leaves-middle-angle))
    translateY(var(--leaves-translate)) translateZ(var(--leaves-middle-width));
}

.leaves-middle div:nth-child(2) {
  border-bottom: solid var(--leaves-middle-height) var(--leaves-middle-bg-2);
  transform: rotateY(90deg) rotateX(calc(var(--leaves-middle-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-middle-width) * -1));
}

.leaves-middle div:nth-child(3) {
  border-bottom: solid var(--leaves-middle-height) var(--leaves-middle-bg-1);
  transform: rotateX(calc(var(--leaves-middle-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-middle-width) * -1));
}

.leaves-middle div:nth-child(4) {
  border-bottom: solid var(--leaves-middle-height) var(--leaves-middle-bg-2);
  transform: rotateY(-90deg) rotateX(calc(var(--leaves-middle-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-middle-width) * -1));
}

.leaves-top div {
  border-top: none;
  border-left: solid var(--leaves-top-width) transparent;
  border-right: solid var(--leaves-top-width) transparent;
  position: absolute;
  top: var(--star-size);
  left: calc(50% - var(--leaves-top-width));
  transform-origin: bottom;
}

.leaves-top div:nth-child(1) {
  border-bottom: solid var(--leaves-top-height) var(--leaves-top-bg-1);
  transform: rotateX(var(--leaves-top-angle))
    translateY(var(--leaves-translate)) translateZ(var(--leaves-top-width));
}

.leaves-top div:nth-child(2) {
  border-bottom: solid var(--leaves-top-height) var(--leaves-top-bg-2);
  transform: rotateY(90deg) rotateX(calc(var(--leaves-top-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-top-width) * -1));
}

.leaves-top div:nth-child(3) {
  border-bottom: solid var(--leaves-top-height) var(--leaves-top-bg-1);
  transform: rotateX(calc(var(--leaves-top-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-top-width) * -1));
}

.leaves-top div:nth-child(4) {
  border-bottom: solid var(--leaves-top-height) var(--leaves-top-bg-2);
  transform: rotateY(-90deg) rotateX(calc(var(--leaves-top-angle) * -1))
    translateY(var(--leaves-translate))
    translateZ(calc(var(--leaves-top-width) * -1));
}

@keyframes tree-rotate {
  0% {
    transform: rotateX(0deg) rotateY(0deg);
  }
  99.99999% {
    transform: rotateX(0deg) rotateY(359deg);
  }
}

.shadow {
  background-color: rgba(0, 0, 0, 0.8);
  width: calc(var(--leaves-bottom-width) * 2);
  height: calc(var(--leaves-bottom-width) * 2);
  filter: blur(calc(var(--leaves-bottom-width) / 2));
  position: absolute;
  bottom: calc(var(--leaves-bottom-width) * -1);
  left: calc(50% - var(--leaves-bottom-width));
  transform: rotateX(90deg) translateX(-50%);
  animation: 10s shadow-rotate linear infinite;
}

@keyframes shadow-rotate {
  0% {
    transform: rotateX(-90deg) rotateZ(0deg);
  }
  99.99999% {
    transform: rotateX(-90deg) rotateZ(359deg);
  }
}

.star-1 {
  transform: translateZ(-2px);
  animation: 10s star-1-rotate linear infinite;
}

@keyframes star-1-rotate {
  0% {
    transform: rotateX(0deg) rotateY(0deg) translateZ(-2px);
  }
  99.99999% {
    transform: rotateX(0deg) rotateY(359deg) translateZ(-2px);
  }
}

.star-2 {
  transform: translateZ(-1px);
  animation: 10s star-2-rotate linear infinite;
}

@keyframes star-2-rotate {
  0% {
    transform: rotateX(0deg) rotateY(0deg) translateZ(-1px);
  }
  99.99999% {
    transform: rotateX(0deg) rotateY(359deg) translateZ(-1px);
  }
}

.star-3 {
  transform: translateZ(0px);
  animation: 10s star-3-rotate linear infinite;
}

@keyframes star-3-rotate {
  0% {
    transform: rotateX(0deg) rotateY(0deg) translateZ(0px);
  }
  99.99999% {
    transform: rotateX(0deg) rotateY(359deg) translateZ(0px);
  }
}

.star-4 {
  transform: translateZ(1px);
  animation: 10s star-4-rotate linear infinite;
}

@keyframes star-4-rotate {
  0% {
    transform: rotateX(0deg) rotateY(0deg) translateZ(1px);
  }
  99.99999% {
    transform: rotateX(0deg) rotateY(359deg) translateZ(1px);
  }
}

.star-5 {
  transform: translateZ(2px);
  animation: 10s star-5-rotate linear infinite;
}

@keyframes star-5-rotate {
  0% {
    transform: rotateX(0deg) rotateY(0deg) translateZ(2px);
  }
  99.99999% {
    transform: rotateX(0deg) rotateY(359deg) translateZ(2px);
  }
}

.star,
.star:before,
.star:after {
  content: '';
  height: 0;
  width: 0;
  border-top: solid 30px var(--star-bg);
  border-left: solid 45px transparent;
  border-right: solid 45px transparent;
  position: absolute;
  top: 0;
  left: calc(50% - 45px);
}

.star:before {
  transform: rotate(72deg);
  top: -33px;
  left: -46px;
}

.star:after {
  transform: rotate(287deg);
  top: -33px;
  left: -44px;
}

.shine {
  background: var(--shine-bg);
  height: 90px;
  width: 90px;
  position: absolute;
  top: -45px;
  left: calc(50% - 45px);
  border-radius: 50%;
  transform: translateZ(40px);
  filter: blur(20px);
  opacity: 0.6;
  animation: 5s shine linear infinite;
}

@keyframes shine {
  0% {
    transform: scale(1) translateZ(40px);
  }
  50% {
    transform: scale(1.5) translateZ(40px);
  }
  100% {
    transform: scale(1) translateZ(40px);
  }
}

.snow-container {
  width: 100%;
  height: 100%;
  position: absolute;
}

.snow {
  position: absolute;
}

.snow:before {
  content: '';
  background-color: var(--snow-bg);
  width: 100%;
  height: 100%;
  position: absolute;
  border-radius: 50%;
}

.snow-y-1:before {
  animation: 8s snow-y-1 ease-in infinite, 8s snow-y-0 linear infinite;
}

.snow-y-2:before {
  animation: 6s snow-y-2 ease-in infinite, 6s snow-y-0 linear infinite;
}

.snow-y-3:before {
  animation: 4s snow-y-2 ease-in infinite, 4s snow-y-0 linear infinite;
}

.snow-1 {
  width: 20px;
  height: 20px;
  top: calc(50% - 250px);
  left: calc(50% - 10px);
  animation: 1s snow-x linear infinite;
}

.snow-2 {
  width: 15px;
  height: 15px;
  top: calc(50% - 300px);
  left: calc(50% - 30px);
  animation: 0.8s snow-x linear infinite 0.1s;
}

.snow-3 {
  width: 10px;
  height: 10px;
  top: calc(50% - 400px);
  left: calc(50% + 60px);
  animation: 0.6s snow-x linear infinite 0.8s;
}

.snow-4 {
  width: 25px;
  height: 25px;
  top: calc(50% - 200px);
  left: calc(50% + 50px);
  animation: 0.5s snow-x linear infinite 0.5s;
}

.snow-5 {
  width: 18px;
  height: 18px;
  top: calc(50% - 200px);
  left: calc(50% - 50px);
  animation: 0.5s snow-x linear infinite 0.5s;
}

.snow-6 {
  width: 12px;
  height: 12px;
  top: calc(50% - 150px);
  left: calc(50% - 120px);
  animation: 0.8s snow-x linear infinite 0.5s;
}

.snow-7 {
  width: 20px;
  height: 20px;
  top: calc(50% - 150px);
  left: calc(50% + 75px);
  animation: 1s snow-x linear infinite 0.6s;
}

.snow-8 {
  width: 22px;
  height: 22px;
  top: calc(50% - 10px);
  left: calc(50% - 30px);
  animation: 1s snow-x linear infinite 0.8s;
}

.snow-9 {
  width: 8px;
  height: 8px;
  top: calc(50% - 250px);
  left: calc(50% - 30px);
  animation: 1s snow-x linear infinite 0.8s;
}

.snow-10 {
  width: 13px;
  height: 13px;
  top: calc(50% - 250px);
  left: calc(50% - 100px);
  animation: 1s snow-x linear infinite 0.8s;
}

@keyframes snow-x {
  0% {
    transform: translateX(0px);
  }
  25% {
    transform: translateX(5px);
  }
  50% {
    transform: translateX(0px);
  }
  75% {
    transform: translateX(-5px);
  }
  100% {
    transform: translateX(0px);
  }
}

@keyframes snow-y-0 {
  0% {
    opacity: 1;
  }
  60% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@keyframes snow-y-1 {
  0% {
    transform: translateY(0px);
  }
  99.99999% {
    transform: translateY(300px);
  }
  100% {
    transform: translateY(0px);
  }
}

@keyframes snow-y-2 {
  0% {
    transform: translateY(0px);
  }
  99.99999% {
    transform: translateY(400px);
  }
  100% {
    transform: translateY(0px);
  }
}

@keyframes snow-y-3 {
  0% {
    transform: translateY(0px);
  }
  99.99999% {
    transform: translateY(500px);
  }
  100% {
    transform: translateY(0px);
  }
}
</style>
